title: Prevalence and characteristics of Shiga toxin-producing Escherichia coli (STEC) from cattle in Korea between 2010 and 2011.
abstract: A total of 156 Shiga-like toxin producing Escherichia coli (STEC) were isolated from fecal samples of Korean native (100/568, 18%) and Holstein dairy cattle (56/524, 11%) in Korea between September 2010 and July 2011. Fifty-two STEC isolates (33%) harbored both of shiga toxin1 (stx1) and shiga toxin2 (stx2) genes encoding enterohemolysin (EhxA) and autoagglutinating adhesion (Saa) were detected by PCR in 83 (53%) and 65 (42%) isolates, respectively. By serotyping, six STEC from native cattle and four STEC from dairy cattle were identified as O-serotypes (O26, O111, O104, and O157) that can cause human disease. Multilocus sequence typing and pulsed-field gel electrophoresis patterns highlighted the genetic diversity of the STEC strains and difference between strains collected during different years. Antimicrobial susceptibility tests showed that the multidrug resistance rate increased from 12% in 2010 to 42% in 2011. Differences between isolates collected in 2010 and 2011 may have resulted from seasonal variations or large-scale slaughtering in Korea performed to control a foot and mouth disease outbreak that occurred in early 2011. However, continuous epidemiologic studies will be needed to understand mechanisms. More public health efforts are required to minimize STEC infection transmitted via dairy products and the prevalence of these bacteria in dairy cattle.
authors.affiliation: Department of Microbiology, College of Veterinary Medicine and BK21 Program for Veterinary Science, Seoul National University, Seoul 151-742, Korea.
authors.forename: Eun
authors.initials: E
authors.lastname: Kang
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Hwang
authors.forename: Ka Hee
authors.initials: KH
authors.lastname: Kwon
authors.forename: Ki Yeon
authors.initials: KY
authors.lastname: Kim
authors.forename: Jae Hong
authors.initials: JH
authors.lastname: Kim
authors.forename: Yong Ho
authors.initials: YH
authors.lastname: Park
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002417:Cattle / Q000382:microbiology; D024901:Drug Resistance, Multiple, Bacterial; D016521:Electrophoresis, Gel, Pulsed-Field / Q000662:veterinary; D004927:Escherichia coli Infections / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D005260:Female; D005798:Genes, Bacterial / Q000235:genetics; D007841:Latex Fixation Tests / Q000662:veterinary; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D058885:Multilocus Sequence Typing / Q000662:veterinary; D015995:Prevalence; D056910:Republic of Korea / Q000453:epidemiology; D022622:Shiga Toxin 1 / Q000235:genetics; D022641:Shiga Toxin 2 / Q000235:genetics; D054323:Shiga-Toxigenic Escherichia coli / Q000187:drug effects / Q000235:genetics
chemical_list: D000900:Anti-Bacterial Agents; D022622:Shiga Toxin 1; D022641:Shiga Toxin 2
keywords: Escherichia coli; Shiga toxin; cattle; multidrug resistance; serotyping